Addon shows the name but no icon in the window customize

I recently developed an add-on. However, once installed the icon does not show, but only the name of the addon in the window customize bar addon (or menu Australis).
I have not seen this behavior in other addons, so I think it's probably something that I did wrong.
Maybe I don't get the right size icon?

You can try to ask the advice of the forum of the modules or the forum MozillaZine extensions development.

Tags: Firefox

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